https://llvm.org/bugs/show_bug.cgi?id=28961
Bug ID: 28961
Summary: Cannot select VZEXT_MOVL under AVX512
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: mku...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Reducted testcase:
===
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define fastcc void @foo() {
entry:
%l = load <8 x i64>, <8 x i64>* undef, align 8
%s = shufflevector <8 x i64> <i64 undef, i64 0, i64 0, i64 0, i64 0, i64 0,
i64 0, i64 0>, <8 x i64> %l, <8 x i32> <i32 8, i32 1, i32 2, i32 3, i32 4, i32
5, i32 6, i32 7>
br label %loop
loop:
%p = phi <8 x i64> [ %s, %entry ], [ %b, %loop ]
%b = xor <8 x i64> undef, %p
br i1 false, label %end, label %loop
end:
%x = xor <8 x i64> undef, %b
ret void
}
===
llc -mattr=+avx512f errors out:
LLVM ERROR: Cannot select: 0x3a3f350: v8i64 = X86ISD::VZEXT_MOVL 0x3a3f120
0x3a3f120: v8i64,ch = load<LD64[undef](align=8)> 0x39d76e0, undef:i64,
undef:i64
0x3a3f040: i64 = undef
0x3a3f040: i64 = undef
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